You MUST mic the cylinders--all of them--to determine what your "bore" is now, especially down in the belly of the beast where they get barrel shaped. Only then will you know if you can go with a 4.060 piston.

If you think there is enough meat there to go to 4.060, then you MUST get the pistons and take them and block to the machine shop with the clearance specs for the pistons. They will bore and hone and number the pistons for you so you get them in the right holes.

You can't hone these in the driveway under a trouble lamp at night with a drill and a ball hone... But, if you must diy, get a cylinder hone and drill and have at it. Measure 64 times, cut once:

The Smooth Science of Cylinder Honing, Larry Carley, Engine Builder, November 2002